Ghost Collapse : exploring feasibility of spurious Spherical Collapses
Cosmology and Nongalactic Astrophysics
2019-02-26 v1
Abstract
We explore the real solutions to the Spherical Collapse Model in a non-flat Universe with a Cosmological Constant, and observe a possible situation for a fake or Ghost Collapse, in which an expanding overdense spherical region, turns around and begins to collapse, turns around again after a finite time and starts expanding. To make such a situation of spurious collapse feasible, we make a linear redshift dependent correction to the standard Dark Energy density term which is originally in the form of a cosmological constant. There is good reason to believe in such a correction based on recent research which hints that Dark Energy desnity evolves with the redshift (even becomes negative) when fit to observational data.
Cite
@article{arxiv.1902.09125,
title = {Ghost Collapse : exploring feasibility of spurious Spherical Collapses},
author = {Aditya Vidhate and Rahul Nigam},
journal= {arXiv preprint arXiv:1902.09125},
year = {2019}
}